Thanks @ToolAA! the Black Aces pros S4 I got come with a fixed rifle stock (non pistol grip) It has a Benelli M2 styles recoil buffer tube, it is stright smooth tube without any slot. I have heard the newer m4 clone with pistol grip version does come with the slotted tube. So it will fit OEM Collapsible stock? Does your Turknelli Collapsible buttstock kit come with its own recoil tube? Do you just transfer the spring and plug to new tube? If it does, it will solve my problem.
The stock S4 tube is totally smooth. The Collapsible kit I linked does come with a new tube that is slotted similar to how an AR-15 buffer tube works. It also included the spting and buffer. Although swapped the spring for the OEM Benelli spring.
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